/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.falcon.entity.v0;
import org.apache.falcon.FalconException;
import org.apache.falcon.Pair;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
/**
* Helper methods to check integrity of entity.
*/
public final class EntityIntegrityChecker {
private EntityIntegrityChecker() {}
public static Pair<String, EntityType>[] referencedBy(Entity entity) throws FalconException {
Set<Entity> deps = EntityGraph.get().getDependents(entity);
switch (entity.getEntityType()) {
case CLUSTER:
return filter(deps, EntityType.FEED, EntityType.PROCESS);
case FEED:
return filter(deps, EntityType.PROCESS);
case DATASOURCE:
return filter(deps, EntityType.FEED);
default:
return null;
}
}
@SuppressWarnings("unchecked")
private static Pair<String, EntityType>[] filter(Set<Entity> deps, EntityType... types) {
List<Pair<String, EntityType>> filteredSet = new ArrayList<Pair<String, EntityType>>();
List<EntityType> validTypes = Arrays.asList(types);
for (Entity dep : deps) {
if (validTypes.contains(dep.getEntityType())) {
filteredSet.add(Pair.of(dep.getName(), dep.getEntityType()));
}
}
return filteredSet.toArray(new Pair[0]);
}
}